Trace element partitioning between clinopyroxene, magnetite, ilmenite and ferrobasaltic to dacitic magmas: an experimental study on the role of oxygen fugacity and melt composition
Shepherd, Kat; Namur, Olivier; Toplis, Michael J.et al.
2022 • In Contributions to Mineralogy and Petrology, 177 (9)
Clinopyroxene; Ilmenite; Magnetite; Oxygen fugacity; Trace element partitioning; Vanadium; Geophysics; Geochemistry and Petrology
Abstract :
[en] Ilmenite-, magnetite- and clinopyroxene−melt trace element partition coefficients were investigated experimentally as a function of oxygen fugacity and melt composition in a range of synthetic ferrobasaltic bulk compositions. The experiments were performed at a constant temperature (1080 °C) and pressure (1 atm) over a range of oxygen fugacity (fO2) conditions from ca. 2 log units below to ca. 2 log units above the FMQ buffer. The partitioning behaviour of the divalent cations Zn, Mn, Co and Ni are found to be controlled by the degree of polymerisation of the coexisting melt; the partitioning behaviour of rare earth elements, Y and Sc can be explained well by the lattice strain model and the partitioning of the high-field strength elements Zr, Hf, Ta and Nb is influenced by the TiO2 content of the melt. Vanadium partitioning is strongly influenced by oxygen fugacity and a series of linear regression equations are presented to express the dependence of the mineral−melt partitioning behaviour of the multivalent cation V on oxygen fugacity. Furthermore, calibration of the partitioning of vanadium between magnetite–ilmenite pairs as an oxybarometer is proposed and applied to a ferrobasaltic layered intrusion—the Skaergaard intrusion—to provide an estimate of oxygen fugacity.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Shepherd, Kat ; Department of Earth and Environmental Sciences, KU Leuven, Louvain, Belgium
Namur, Olivier; Department of Earth and Environmental Sciences, KU Leuven, Louvain, Belgium
Toplis, Michael J.; Institut de Recherche en Astrophysique Et Planétologie (IRAP/CNRS), Toulouse, France
Devidal, Jean-Luc; Laboratoire Magmas Et Volcans, Université Clermont Auvergne, CNRS, IRD, OPGC, Aubière, France
Charlier, Bernard ; Université de Liège - ULiège > Département de géologie > Pétrologie, géochimie endogènes et pétrophysique
Language :
English
Title :
Trace element partitioning between clinopyroxene, magnetite, ilmenite and ferrobasaltic to dacitic magmas: an experimental study on the role of oxygen fugacity and melt composition
Publication date :
September 2022
Journal title :
Contributions to Mineralogy and Petrology
ISSN :
0010-7999
eISSN :
1432-0967
Publisher :
Springer Science and Business Media Deutschland GmbH
We thank Jon Blundy, Raul Fonseca and an anonymous reviewer, and executive editor Othmar Müntener for their constructive reviews which significantly improved the quality of this manuscript. O. Namur and K. Shepherd acknowledge financial support from the FWO through an Odysseus grant to O. Namur. B. Charlier is a Research Associate of the Belgian Fund for Scientific Research-FNRS.
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